According to the official DayZ website, the insanely popular ArmA II zombie survival mod has continued to be insanely popular. The number of unique users is now over 900,000!

No doubt part of this comes from the recent Steam Summer Sale, which ArmA II: Combined Operations was predictably a part of. It's no surprise that Combined Operations still sits in the top of the Steam sales charts, currently occupying the number two slot right behind the recently released Orcs Must Die! 2.